Debian -- Getting Debian
debian.org/distribYou can install Debian (on as many machines as you like) without downloading all packages yourself. The CD can be used to more easily rescue a damaged Debian system. Buy a computer with Debian pre-installed. There are a number of advantages to this: You don't have to install Debian. The installation is pre-configured to match the hardware.
Debian -- Getting Debian
debian.org › distribYou can try Debian by booting a live system from a CD, DVD or USB key without installing any files to the computer. When you are ready, you can run the included installer (starting from Debian 10 Buster, this is the end-user-friendly Calamares Installer ).